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Hi, just stumbled upon your blog whilst looking into gas meter monitoring. Unfortunately mine doesn’t have an RJ11, Just a reflective 0, so IR detector time.

Anyway, the hiss noise you heard would have been an old (duff) capacitor venting pressure. Eventually it couldn’t vent it fast enough, so went bang. They’re quite spectacular when they’re not inside a metal box (although you wouldn’t want to be too near!).

Great project BTW. I really must do something this productive, sorry, entertaining, with my Pi’s :-)